UNO arrived well ahead of schedule last year, as Ryan Keele’s dramatic walk-off homer against South Dakota State clinched the Summit League’s regular-season title on the final weekend of the league season. But that was the Mavericks’ final weekend. They, even now, still have two years left before being eligible for the postseason as part of their transition to Division I. “My biggest regret for these guys is that you play your season to play the postseason,” coach Bob Herold said Tuesday at the team’s media day, referring to the players who joined him at the podium. “I told them last year that we were the only team in the country, besides the national champions, to win our last game of the season.”